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Installation problems

I've been reading the threads on what brand is best, and what most of you say is that it really depends on whether the equipment is installed properly. So my question of the day to the experts is: What can go wrong with the installation, and what types of questions should I ask (besides asking for references) that would help me evaluate whether the contractor can install the unit so I don't have any problems. Thanks.

Really depends on the type of install, attic is probably the worst. Improper install could lead to collapsed ceilings if there is a water leak. Shoddy work can lead noisy system that leak as much air as they deliver. Ask around there are plenty of reputable contractors that will stand behind thier work. There are however, plenty of hacks out there that will leave you warm in summer and cold in the winter.